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st: Aggregate date to calculate n months


From   "Ziad El-Khatib" <Ziad.El-Khatib@ki.se>
To   statalist@hsphsun2.harvard.edu
Subject   st: Aggregate date to calculate n months
Date   Mon, 4 Aug 2008 08:11:32 -0700

Hi!
I entered dates of patients starting on treatment and date of their
interview under different variables:

startd (for day)
startm (for month)
starty (for year)

surveyd (for day)
surveym (month)
surveyy (year)

Now i want to calculate number of months patients have been on treatment.
I am finding problems in creating
start=startd+startm+starty
survey=surveyd+surveym+surveyy

period=survey-start

Any tips?

Thank you and best regards
ziad
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